Composite microbial saline-alkali soil conditioner as well as preparation method and application thereof

Abstract

The invention relates to a compound microorganism saline-alkali soil conditioner as well as a preparation method and application thereof, and relates to the technical field of saline-alkali soil improvement. The compound microorganism saline-alkali soil conditioner is prepared from the following raw materials: a tailing-based organic matter compound, a microorganism compound bacterium agent and ammonium sulfate, the tailing-based organic matter compound is prepared from the following raw materials: iron tailings and wormcast organic fertilizer; the raw materials of the microbial complex microbial inoculant comprise rhizosphere kocuria and bacillus subtilis. The compound microorganism saline-alkali soil conditioner is prepared from the tailing-based organic matter compound, the microorganism compound bacterium agent and ammonium sulfate, the pH value of saline-alkali soil can be reduced, the saline-alkali degree of the saline-alkali soil can be reduced, through the cementation effect of microorganisms, organic fertilizer and mineral particles, soil aggregates are increased, the soil structure is improved, and the soil quality is improved. The hardening state of the saline-alkali soil is improved, the water and fertilizer retention capacity is improved, and the soil ecological environment is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of saline-alkali soil improvement, and in particular to a composite microbial saline-alkali soil improver and a preparation method and application thereof. Background Art

[0002] At present, the world's recognized methods for improving saline-alkali soil include water conservancy projects and agricultural restoration, chemical and biological methods, etc. However, there are inevitably some disadvantages in these methods. Drainage helps to lower the groundwater level, but the cost is high. Using fresh water to press salt is conducive to transferring salt from the plant root zone to deeper soil, but it is difficult to achieve in areas where fresh water is scarce. Chemical reagents can react with certain types of salt and remove them from the soil, but this method is costly and may lead to other negative environmental consequences. The breeding and genetic modification of salt-tolerant plants in saline-alkali soils have a long cycle and high technical cost. Therefore, it is necessary to use green improvement technologies with a wide range of materials, low prices, simple operations, and obvious effects according to local conditions to improve the quality of saline-alkali soils.

[0003] In recent years, the main patents for using iron tailings and composite microorganisms to improve saline-alkali land include CN111057556A, CN111117639A, CN117050913A, CN111117638A, CN111117639A, CN118222292A, and CN119020198A. Most of them focus on single indicators of vegetation growth or soil, and do not fully consider the role of trace elements in iron tailings in saline-alkali soil improvement and soil fertility, ignoring the synergistic effect of "amendment agent-soil-plant". Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a composite microbial saline-alkali soil conditioner and its preparation method and application. The composite microbial saline-alkali soil conditioner prepared by the present invention can not only reduce the pH value of saline-alkali land and reduce its salinity, but also increase soil aggregates and improve soil structure and the compaction state of saline-alkali land through the cementation of microorganisms, organic fertilizers and mineral particles, and enhance the water and fertilizer retention capacity, thereby greatly improving the soil ecological environment.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: The first object of the present invention is to provide a composite microbial saline-alkali soil conditioner, which comprises the following raw materials: tailings-based organic matter complex, microbial composite bacterial agent, and ammonium sulfate; The raw materials of the tailings-based organic compound include iron tailings and earthworm castings organic fertilizer; The raw materials of the microbial composite agent include rhizosphere Coxiella and Bacillus subtilis. The rhizosphere Coxiella is ACCC 60042 Rhizosphere Coxiella, purchased from Beijing Dahong Lihui Biotechnology Center; further, the Bacillus subtilis is ACCC 19742 Bacillus subtilis, purchased from Beijing Dahong Lihui Biotechnology Center.

[0006] The beneficial effects of the present invention are as follows: the raw materials of the composite microbial saline-alkali soil conditioner of the present invention include iron tailings minerals, earthworm castings organic fertilizer, microbial composite bacterial agent, and ammonium sulfate, which can not only reduce the pH value of saline-alkali land and reduce its salinity, but also increase soil aggregates and improve soil structure and the compaction state of saline-alkali land through the cementation effect of microorganisms, organic fertilizers and mineral particles, thereby enhancing the water and fertilizer retention capacity and greatly improving the soil ecological environment.

[0007] The beneficial effects of adopting the above further scheme are: Bacillus subtilis and rhizosphere Coxsporin are beneficial microorganisms for plants, which can alleviate environmental abiotic stresses such as drought and salinity, effectively inhibit a variety of plant pathogens, and at the same time, through their metabolic activities, fully interact with the biochar and nitrogen fertilizer in the invention to improve soil structure and soil fertility, thereby providing a better growth environment for plants. In addition, the rhizosphere Coxsporin selected ACCC 60042 Rhizosphere Coxsporin isolated from a high-salt and alkaline environment can promote the dissolution and precipitation of minerals such as Fe, Si, and K in iron tailings.

[0008] Furthermore, the usage ratio of the tailings-based organic compound, the microbial composite agent, and the ammonium sulfate is 15g~20g: 3ml~5ml: 2g~4g.

[0009] The beneficial effect of adopting the above further scheme is: through the reasonable proportion and proper treatment of iron tailings minerals, earthworm castings organic fertilizers, microbial compound agents, and ammonium sulfate, not only the pH value of saline-alkali land can be reduced, its salinity can be reduced, but also through the cementation of microorganisms with organic fertilizers and mineral particles, the soil aggregates are increased, the soil structure is improved, the compaction state of saline-alkali land is improved, the water and fertilizer retention capacity is enhanced, and the soil ecological environment is greatly improved.

[0010] Furthermore, the effective live bacterial concentration of the Bacillus subtilis in the microbial composite agent is 4×10 7 ~9×10 7 CFU / mL; the effective live bacterial concentration of the rhizosphere Coxsackie bacteria in the microbial composite agent is 4×10 7 ~9×10 7 CFU / mL.

[0011] Furthermore, the volume ratio of the rhizosphere Coxsackie strain to the Bacillus subtilis is 1-2:1-2.

[0012] Furthermore, the water content of the tailings-based organic compound is ≤8%.

[0013] Furthermore, the mass ratio of the iron tailings to the earthworm castings organic fertilizer is 15-20:2-3.

[0014] Furthermore, the raw materials of the earthworm castings organic fertilizer include earthworm castings and biochar; the mass ratio of the earthworm castings to the biochar is 6-7:3-4.

[0015] Furthermore, the volume ratio of the rhizosphere Coxsackie strain to the Bacillus subtilis is 1-2:1-2.

[0016] The second object of the present invention is to provide a method for preparing a composite microbial saline-alkali soil conditioner, comprising the following steps: stirring and mixing a tailings-based organic matter complex with a microbial composite agent and ammonium sulfate to obtain a composite microbial saline-alkali soil conditioner.

[0017] The beneficial effects of the present invention are as follows: the present invention adopts easily accessible and low-cost mineral solid waste and biochar for sufficient aging treatment, fully considers improving the dissociation of various minerals in iron tailings and the salt-alkali tolerance of vegetation, and compounds Bacillus subtilis and rhizospheric Coxsackie, has a simple process, and starts from the synergy of "modifier optimization-soil improvement-plant growth", thereby improving the dissolution and precipitation of minerals such as Fe, Si, and K in iron tailings, increasing soil aggregation structure, improving the ecological environment of saline-alkali land, and optimizing plant colonization and growth conditions, providing a new way for the green recycling of bulk mining waste and the improvement of saline-alkali soil.

[0018] Furthermore, the preparation steps of the tailings-based organic compound are as follows: The earthworm castings and biochar are mixed to obtain earthworm castings organic fertilizer; the iron tailings and earthworm castings organic fertilizer are then mixed, piled and aged to obtain a tailings-based organic matter complex.

[0019] Furthermore, the temperature of the mixed composting is 30-40°C and the time is 2-3 days.

[0020] The third object of the present invention is to provide an application of a composite microbial saline-alkali soil conditioner, wherein the composite microbial saline-alkali soil conditioner is used in improving saline-alkali soil.

[0021] The beneficial effects of the present invention are as follows: the composite microbial saline-alkali soil conditioner prepared by the present invention improves saline-alkali soil, enhances its soil fertility, improves the saline-alkali land ecosystem, provides a good habitat for plant growth, and improves plant quality.

[0022] Furthermore, the saline-alkali soil includes at least one of coastal saline-alkali land, inland saline-alkali land, and secondary salinized soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The spinach in each group of potted plants of Test Example 1 of the present invention was grown for 45 days. DETAILED DESCRIPTION

[0024] The principles and features of the present invention are described below, and the examples are only used to explain the present invention and are not used to limit the scope of the present invention. If no specific technology or conditions are specified in the embodiments, the technology or conditions described in the literature in this field or the product instructions are used. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased through regular channels.

[0025] The earthworm manure and biochar used in the present invention are commercially available products, and the biochar content is ≥45%, and the total nutrients (N+P 2 O 5 +K 2 O) ≥5%, moisture content ≤30%, in line with the national organic fertilizer standards (NY 525-2021).

[0026] Biochar is made by pyrolysis of agricultural waste under oxygen-limited conditions, with a carbon content ≥60%, an ash content ≤20%, a pH value of 7.0~9.0, and a particle size of 0.5~2.0 mm.

[0027] The iron tailings were provided by Hebei Iron and Steel Group Sijiaying Yanshan Iron Ore Co., Ltd. The main components of the iron tailings were analyzed by X-ray fluorescence spectrometry (XRF) using an X-ray fluorescence spectrometer (ZSX Primus II 03030429; Rigaku Corporation, Japan); As and Hg in trace elements were determined by inductively coupled plasma optical emission spectrometry (ICP-OES) using an inductively coupled plasma optical emission spectrometer (ICAP-7400; Thermo Fisher); Pb, Cd and Cr elements were determined by atomic absorption spectrometry (AAS) using a graphite furnace atomizer (GFA-6880; Shimadzu Instruments (Suzhou) Co., Ltd.) and an atomic absorption spectrophotometer (AA-6880; Shimadzu), and the particle size composition of the iron tailings was determined by sieving analysis. Its main components, toxic elements, and particle size distribution are shown in Tables 1, 2, and 3: Table 1 Analysis results of main components of iron tailings The contents of five heavy metals, cadmium, chromium, lead, arsenic and mercury, generally comply with the "Standards for Macroelement Water-soluble Fertilizers" (NY / T1107-2020) of the Ministry of Agriculture and Rural Affairs, and the content of radioactive elements meets the requirements of the "Soil Environmental Quality Standards" (GB 15618-2018).

[0028] Table 2 Analysis of toxic elements in iron tailings Table 3 Analysis of particle size composition of iron tailings Example 1: Preparation of composite microbial saline-alkali soil conditioner In the preparation of the composite microbial saline-alkali soil conditioner in this embodiment, it is necessary to first prepare the raw materials of earthworm manure organic fertilizer, tailings-based organic matter composite, and microbial composite bacterial agent. The specific preparation steps are as follows: a. Preparation of earthworm castings organic fertilizer: The earthworm castings and biochar were mixed in a mass ratio of 7:3 to obtain earthworm castings organic fertilizer.

[0029] b. Preparation of tailings-based organic composites: The iron tailings were sieved through a 200-mesh sieve, and 17.5 g of the iron tailings and 2.5 g of earthworm manure organic fertilizer were mixed. The resulting mixture was fermented for 2.5 days and fully aged to obtain a tailings-based organic matter complex with a moisture content of ≤8%.

[0030] c. Preparation of microbial composite agents: The effective live bacterial concentration was 5.5×10 7 CFU / mL of ACCC 60042 rhizospheric Coxsackie and an effective live bacteria concentration of 5.5×10 7 The Bacillus subtilis of ACCC 19742 with a CFU / mL were mixed in a volume ratio of 1:1 to obtain a microbial composite agent.

[0031] d. Preparation of composite microbial saline-alkali soil conditioner: Mix 15g of tailings-based organic matter complex with 3ml of microbial composite agent and 2g of ammonium sulfate, place in a stirrer and mix thoroughly. The stirring speed is controlled at 225 rpm and the stirring time is 13 minutes to obtain a composite microbial saline-alkali soil conditioner.

[0032] Example 2: Preparation of composite microbial saline-alkali soil conditioner In the preparation of the composite microbial saline-alkali soil conditioner in this embodiment, it is necessary to first prepare the raw materials of earthworm manure organic fertilizer, tailings-based organic matter composite, and microbial composite bacterial agent. The specific preparation steps are as follows: a. Preparation of earthworm castings organic fertilizer: The earthworm castings and biochar were mixed in a mass ratio of 7:3 to obtain earthworm castings organic fertilizer.

[0033] b. Preparation of tailings-based organic composites: The iron tailings, a bulk waste of mining industry, were sieved through a 200-mesh sieve, and 15 g of the iron tailings and 2 g of earthworm manure organic fertilizer were mixed and composted for 2 days and fully aged to obtain a tailings-based organic matter complex with a moisture content of ≤8%.

[0034] c. Preparation of microbial composite agents: The effective live bacterial concentration was 4×10 7 CFU / mL of ACCC 60042 rhizospheric Coxsackie and an effective live bacteria concentration of 4×10 7 The Bacillus subtilis of ACCC 19742 with a CFU / mL were mixed in a volume ratio of 1:1 to obtain a microbial composite agent.

[0035] d. Preparation of composite microbial saline-alkali soil conditioner: Mix 15g of tailings-based organic matter complex with 4ml of microbial composite agent and 3g of ammonium sulfate, place in a stirrer and mix thoroughly, control the stirring speed at 150 rpm, and stir for 15 minutes to obtain a composite microbial saline-alkali soil conditioner.

[0036] Example 3: Preparation of composite microbial saline-alkali soil conditioner III.

[0037] In the preparation of the composite microbial saline-alkali soil conditioner in this embodiment, it is necessary to first prepare the raw materials of earthworm manure organic fertilizer, tailings-based organic matter composite, and microbial composite bacterial agent. The specific preparation steps are as follows: a. Preparation of earthworm castings organic fertilizer: The earthworm castings and biochar were mixed in a mass ratio of 7:3 to obtain earthworm castings organic fertilizer.

[0038] b. Preparation of tailings-based organic composites: The iron tailings were sieved through a 200-mesh sieve, and 20 g of the iron tailings and 3 g of earthworm manure organic fertilizer were mixed and composted for 3 days and aged sufficiently to obtain a tailings-based organic matter complex with a moisture content of ≤8%.

[0039] c. Preparation of microbial composite agents: The effective live bacterial concentration was 9×10 7 CFU / mL of ACCC 60042 rhizospheric Coxsackie and an effective live bacteria concentration of 9×10 7 The Bacillus subtilis of ACCC 19742 with a CFU / mL were mixed in a volume ratio of 1:1 to obtain a microbial composite agent.

[0040] d. Preparation of composite microbial saline-alkali soil conditioner: Mix 15g of tailings-based organic matter complex with 5ml of microbial composite agent and 4g of ammonium sulfate, place in a stirrer and mix thoroughly, control the stirring speed at 300 rpm, and stir for 10 minutes to obtain a composite microbial saline-alkali soil conditioner.

[0041] Comparative Example 1: Preparation of composite microbial saline-alkali soil conditioner This comparative example is the same as Example 1, except that no microbial composite agent is added when preparing the composite microbial saline-alkali soil conditioner. The specific preparation steps are as follows: a. Preparation of earthworm castings organic fertilizer: The earthworm castings and biochar were mixed in a mass ratio of 7:3 to obtain earthworm castings organic fertilizer.

[0042] b. Preparation of tailings-based organic composites: The iron tailings were sieved through a 200-mesh sieve, and 15 g of the iron tailings and 2 g of earthworm manure organic fertilizer were mixed and composted for 2 days and fully aged to obtain a tailings-based organic matter complex with a moisture content of ≤8%.

[0043] c. Preparation of composite saline-alkali soil conditioner: 15 g of tailings-based organic matter complex was mixed with 3 g of ammonium sulfate, and the mixture was placed in a stirrer and mixed thoroughly. The stirring speed was controlled at 225 rpm and the stirring time was 13 minutes to obtain a composite microbial saline-alkali soil conditioner.

[0044] Comparative Example 2: Preparation of composite saline-alkali soil conditioner This comparative example is the same as Example 1, except that no tailings-based organic compound is added when preparing the composite microbial saline-alkali soil conditioner. The specific preparation steps are as follows: a. Preparation of earthworm castings organic fertilizer: The earthworm castings and biochar were mixed in a mass ratio of 7:3 to obtain earthworm castings organic fertilizer.

[0045] b. Preparation of microbial composite agents: The effective live bacterial concentration was 4×10 7 CFU / mL of ACCC 60042 rhizospheric Coxsackie and an effective live bacteria concentration of 4×10 7 Bacillus subtilis of ACCC 19742 with a CFU / mL were mixed in a volume ratio of 1:1 to obtain a microbial composite agent.

[0046] c. Preparation of composite microbial saline-alkali soil conditioner: Mix 3 ml of the microbial composite agent with 3 g of ammonium sulfate, place in a stirrer and mix thoroughly. The stirring speed is controlled at 225 rpm and the stirring time is 13 minutes to obtain a composite microbial saline-alkali soil conditioner.

[0047] Test Example 1: The test selected uncultivated wasteland in Caofeidian District, Tangshan City, Hebei Province, with a saline-alkali soil with a moderate salinity. The soil was sieved through a 3mm sieve, and the sieved soil was mixed evenly with the composite microbial saline-alkali soil conditioner prepared in Example 1 (according to 15% of the total mass of the sieved soil), and watered and potted at 70% of the maximum water holding rate. The flower pot had a diameter of 20cm and a height of 25cm, and there were drainage holes at the bottom. Before filling the soil, non-woven fabric was placed at the bottom, and about 2cm of gravel was placed at the bottom. Vaseline was applied to the wall of the flower pot to prevent edge effects with the soil. During the period, regular watering was carried out by the weight method to maintain a maximum water holding rate of 60-70%, and the soil was loosened regularly. After balancing for 30 days, spinach (Boza No. 10), a common vegetation, was selected as the observation target for potted planting.

[0048] After 45 days of potted spinach planting, the potted soil was collected and its soil physical and chemical indicators were measured: organic matter, alkaline nitrogen, available phosphorus, available potassium, available silicon, available iron, bulk density, pH value, soil salinity, soil porosity, and spinach survival rate, maximum plant height, aboveground biomass, fresh weight of underground (root) biomass, main root length, root surface area, and maximum root diameter parameter indicators were measured. The soil without the composite microbial saline-alkali soil conditioner was used as the control (CK), the soil with the composite microbial saline-alkali soil conditioner prepared in Example 1, Example 2, and Example 3 was added as the experimental group, and the composite saline-alkali soil conditioner prepared in Comparative Example 1 and Comparative Example 2 was added as the comparative group to verify the improvement effect of the present invention on saline-alkali land and vegetation. The results are as follows: Figure 1 , as shown in Table 4 and Table 5.

[0049] Table 4 Effects of amendments on soil properties in saline-alkali land Table 5 Experimental results and ranking of improvement effects Depend on Figure 1 , Table 4, Table 5 can be obtained: (1) The soil physical and chemical indicators and plant growth indicators of Example 1, Example 2 and Example 3 were significantly better than those of the control group (CK group). The soil salinity, pH value, soil porosity, bulk density, available silicon, available iron, alkaline nitrogen, available potassium, available phosphorus and organic matter of the Example group all showed significant improvement. For example, the soil salinity of the Example 1 group decreased from 0.53 g / kg to 0.41 g / kg, the pH value decreased from 8.4 to 8.3, and the organic matter increased from 22.4 g / kg to 42.3 g / kg. In terms of plant growth, the survival rate of spinach in Example 1 increased from 71.3% to 88.7%, and the maximum plant height increased from 17.2 cm to 28.5 cm. The results of Example 2 and Example 3 also showed similar improvement trends. The composite microbial saline-alkali soil conditioner not only effectively reduces the pH value and salinity of the soil through the reasonable ratio and synergistic effect of tailings minerals, organic matter, microorganisms and nitrogen fertilizers, but also promotes the formation of soil aggregates through the interaction between microorganisms, organic fertilizers and mineral particles, improves soil structure, and enhances water and fertilizer retention capacity, thereby significantly improving the soil ecological environment and creating soil conditions conducive to plant growth.

[0050] (2) The improvement effects of Comparative Examples 1 and 2 were significantly lower than those of the Example Group. Comparative Example 1 only used tailings-based organic matter complexes and lacked microbial composite agents. Although the soil physical and chemical indicators were improved, the effect was significantly inferior to that of the Example Group. For example, the soil salt content of Comparative Example 1 was 0.49 g / kg, and the spinach survival rate was 75.2%, both lower than 0.41 g / kg and 88.7% in Example 1. Comparative Example 2 only used microbial composite agents and lacked tailings-based organic matter complexes. The improvement of trace elements in the soil was limited, and the plant growth conditions were not fully optimized. The spinach survival rate was 78.5%, and the soil salt content was 0.50 g / kg, both lower than 0.41 g / kg and 88.7% in Example 1. This shows that the use of tailings-based organic matter complexes or microbial composite agents alone cannot achieve the effect of combined use, and the synergistic effect of the two is crucial for the improvement of saline-alkali soil.

[0051] (3) In addition, the Bacillus subtilis and rhizospheric Coxsporin used in the present invention are beneficial microorganisms for plants, which can alleviate environmental abiotic stresses such as drought and salinity, and effectively inhibit a variety of plant pathogens. At the same time, through their metabolic activities, they fully interact with the biochar and nitrogen fertilizer in the present invention to improve soil structure and soil fertility, thereby providing a better growth environment for plants; rhizospheric Coxsporin can also promote the dissolution and precipitation of minerals such as Fe, Si, and K in iron tailings.

[0052] In summary, the composite microbial saline-alkali soil conditioner of the present invention has the functions of increasing the mineral trace elements in saline-alkali land, promoting the formation of soil aggregates, improving the tolerance of plants to salt and alkali, and providing optimized saline-alkali soil conditions for plant colonization.

[0053] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A composite microbial saline-alkali soil conditioner, characterized in that: The composite microbial saline-alkali soil conditioner comprises the following raw materials: tailings-based organic matter complex, microbial composite bacterial agent, and ammonium sulfate; The raw materials of the tailings-based organic compound include iron tailings and earthworm castings organic fertilizer; The raw materials of the microbial composite agent include rhizosphere Coxsackie bacteria and Bacillus subtilis.

2. A composite microbial saline-alkali soil conditioner according to claim 1, characterized in that: The usage ratio of the tailings-based organic compound, the microbial composite agent, and the ammonium sulfate is 15g~20g: 3ml~5ml: 2g~4g.

3. A composite microbial saline-alkali soil conditioner according to claim 1, characterized in that: The effective live bacterial concentration of the Bacillus subtilis in the microbial composite agent is 4×10 7 ~9×10 7 CFU / mL; the effective live bacterial concentration of the rhizosphere Coxsackie bacteria in the microbial composite agent is 4×10 7 ~9×10 7 CFU / mL.

4. A composite microbial saline-alkali soil conditioner according to claim 1, characterized in that: The water content of the tailings-based organic compound is ≤8%.

5. A composite microbial saline-alkali soil conditioner according to claim 4, characterized in that: The mass ratio of the iron tailings to the earthworm castings organic fertilizer is 15-20:2-3.

6. A composite microbial saline-alkali soil conditioner according to claim 5, characterized in that: The raw materials of the earthworm castings organic fertilizer include earthworm castings and biochar; the mass ratio of the earthworm castings to the biochar is 6-7:3-4.

7. A method for preparing a composite microbial saline-alkali soil conditioner according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: stirring and mixing the tailings-based organic matter complex, the microbial composite bacterial agent and ammonium sulfate to obtain a composite microbial saline-alkali soil conditioner.

8. The method for preparing a composite microbial saline-alkali soil conditioner according to claim 7, characterized in that: The steps for preparing the tailings-based organic compound are as follows: The earthworm castings and biochar are mixed to obtain earthworm castings organic fertilizer; the iron tailings and earthworm castings organic fertilizer are then mixed, piled and aged to obtain a tailings-based organic matter complex.

9. An application of a composite microbial saline-alkali soil conditioner, characterized in that: The composite microbial saline-alkali soil conditioner according to any one of claims 1 to 6 is used for improving saline-alkali soil.

10. The use of a composite microbial saline-alkali soil conditioner according to claim 9, characterized in that: The saline-alkali soil includes at least one of coastal saline-alkali land, inland saline-alkali land, and secondary salinized soil.

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